1 /* 2 ** License Applicability. Except to the extent portions of this file are 3 ** made subject to an alternative license as permitted in the SGI Free 4 ** Software License B, Version 1.1 (the "License"), the contents of this 5 ** file are subject only to the provisions of the License. You may not use 6 ** this file except in compliance with the License. You may obtain a copy 7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: 9 ** 10 ** http://oss.sgi.com/projects/FreeB 11 ** 12 ** Note that, as provided in the License, the Software is distributed on an 13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS 14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND 15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A 16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT. 17 ** 18 ** Original Code. The Original Code is: OpenGL Sample Implementation, 19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, 20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. 21 ** Copyright in any portions created by third parties is as indicated 22 ** elsewhere herein. All Rights Reserved. 23 ** 24 ** Additional Notice Provisions: The application programming interfaces 25 ** established by SGI in conjunction with the Original Code are The 26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released 27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version 28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X 29 ** Window System(R) (Version 1.3), released October 19, 1998. This software 30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation 31 ** published by SGI, but has not been independently verified as being 32 ** compliant with the OpenGL(R) version 1.2.1 Specification. 33 ** 34 */ 35 /* 36 */ 37 38 //#include <stdlib.h> 39 //#include <stdio.h> 40 41 42 static void swap(void *v[], int i, int j) 43 { 44 void *temp; 45 temp = v[i]; 46 v[i] = v[j]; 47 v[j] = temp; 48 } 49 50 /*as an example to use this function to 51 *sort integers, you need to supply the function 52 *int comp(int *i1, int *i2) 53 *{ 54 * if( *i1 < * i2) return -1; 55 * else return 1; 56 *} 57 *and an array of pointers to integers: 58 * int *v[100] (allocate space for where each v[i] points to). 59 *then you can call: 60 * quicksort( (void**)v, left, right, (int (*)(void *, void *))comp) 61 */ 62 void quicksort(void *v[], int left, int right, 63 int (*comp) (void *, void *)) 64 { 65 int i, last; 66 if(left >= right) /*do nothing if array contains */ 67 return; /*fewer than two elements*/ 68 69 swap(v, left, (left+right)/2); 70 last = left; 71 for(i=left+1; i<=right; i++) 72 if((*comp)(v[i], v[left])<0) 73 swap(v, ++last, i); 74 swap(v, left, last); 75 quicksort(v, left, last-1, comp); 76 quicksort(v, last+1, right, comp); 77 } 78